CN112537834A - Method for removing heavy metal ions in wastewater - Google Patents
Method for removing heavy metal ions in wastewater Download PDFInfo
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- CN112537834A CN112537834A CN202011535115.2A CN202011535115A CN112537834A CN 112537834 A CN112537834 A CN 112537834A CN 202011535115 A CN202011535115 A CN 202011535115A CN 112537834 A CN112537834 A CN 112537834A
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- wastewater
- heavy metal
- metal ions
- removing heavy
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- 239000002351 wastewater Substances 0.000 title claims abstract description 49
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 35
- 150000002500 ions Chemical class 0.000 title claims abstract description 29
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000000701 coagulant Substances 0.000 claims abstract description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052802 copper Inorganic materials 0.000 claims abstract description 17
- 239000010949 copper Substances 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 16
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 15
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000000706 filtrate Substances 0.000 claims abstract description 5
- 239000008394 flocculating agent Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000005189 flocculation Methods 0.000 claims description 12
- 230000016615 flocculation Effects 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 7
- 125000001741 organic sulfur group Chemical group 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 239000012065 filter cake Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 238000004073 vulcanization Methods 0.000 claims description 2
- 238000005987 sulfurization reaction Methods 0.000 claims 1
- VDGMIGHRDCJLMN-UHFFFAOYSA-N [Cu].[Co].[Ni] Chemical compound [Cu].[Co].[Ni] VDGMIGHRDCJLMN-UHFFFAOYSA-N 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 238000003541 multi-stage reaction Methods 0.000 abstract description 2
- 239000002562 thickening agent Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 238000005192 partition Methods 0.000 description 6
- 230000003311 flocculating effect Effects 0.000 description 5
- 230000001112 coagulating effect Effects 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000011550 stock solution Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- -1 arsenic ions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses a method for removing heavy metal ions in wastewater, which comprises the steps of stirring and homogenizing the wastewater, then feeding the wastewater into a reactor, and utilizing the grading reaction function in the reactor, wherein the nickel, copper and arsenic heavy metal ions in the wastewater, a vulcanizing agent, a coagulant and a flocculating agent are sequentially and gradually precipitated, coagulated and flocculated in the reactor, and after the reaction is completed within 2-3 seconds, the filtrate can meet the special emission limit requirement of heavy metal ions in the emission standard of nickel-copper-cobalt industrial pollutants (GB 25467-2010). The invention can realize the standard reaching of heavy metal ions through the first-stage reaction, saves the process and equipment needing to add an intermediate thickener, a filter press and the like in the multi-stage reaction process, can shorten the treatment process, simplify the operation and reduce the operation cost.
Description
Technical Field
The invention relates to a wastewater treatment method, in particular to a method for removing heavy metal ions in wastewater.
Background
In the process of nickel and copper wet smelting, some process wastewater such as precipitated liquid and raffinate is often discharged, and the content of metal ions such as nickel, copper, lead and zinc and arsenic ions in the wastewater is higher than the discharge standard and needs to be treated up to the standard. The ion treatment process generally comprises the steps of firstly adjusting the pH value to 10-11 by lime or liquid alkali, then flocculating by polyferric sulfate, coagulating by adding polyacrylamide, thickening, filtering and discharging clear liquid. The lime is low in price, and when the pH value is adjusted by the lime, valuable metals in the slag are depleted and cannot be recovered and stockpiled; when the pH value is adjusted by liquid alkali, the copper content of the slag can reach 23%, and the slag returns to a pyrogenic process system to recover metals such as copper, nickel and the like.
The process for treating the heavy metal ion wastewater has the main problems that the nickel and copper ion indexes are 1mg/L after the process is designed, the consumption cost of liquid caustic soda is high, the thickening effect is poor, the running and mixing are realized, the stirring and mixing of medicaments are not uniform, the main operation parameters such as pH value, stirring strength and the like are difficult to accurately control, the metal ions such as nickel, copper and the like in a combined state with an extracting agent cannot be treated to reach the standard by using the processes such as precipitation, flocculation and the like, and the treated liquid contains nickel, copper, arsenic and the like, so that the standard reaching rate is low.
Disclosure of Invention
In view of the above technical problems, the present invention provides a method for removing heavy metal ions from wastewater.
The invention adopts the following technical scheme to realize the purpose:
a method for removing heavy metal ions in wastewater comprises the steps of pumping the wastewater after stirring and homogenizing, a vulcanizing agent, a coagulant and a flocculant solution into a reactor from corresponding feed inlets simultaneously; the heavy metal ions of nickel, copper and arsenic in the wastewater and various medicaments are sequentially precipitated, coagulated and flocculated in different reaction chambers in the reactor, the sludge in the effluent after reaction is removed by filter pressing, the filtrate is discharged after reaching the standard, and the heavy metal is recovered by a filter cake backfire system.
The vulcanizing agent is organic sulfur; the mass concentration of the organic sulfur medicament solution is 3-5%; the adding amount of the organic sulfur agent solution is 0.5-1% of the volume of the wastewater.
The coagulant is polymeric aluminum ferric sulfate; the mass concentration of the coagulant solution is 2.5-5%; the addition amount of the coagulant solution is 1-2% of the volume of the wastewater.
The flocculating agent is polyacrylamide; the mass concentration of the flocculant solution is 0.1-0.3%; the addition amount of the flocculant solution is 0.5-1% of the volume of the wastewater.
The reactor includes the casing, the inside baffle that is equipped with of casing, the baffle leaves the clearance with casing upper portion, the baffle is the deposit room, thoughtlessly congeals room, flocculation chamber with the casing interval, the deposit room bottom is equipped with the inlet tube, be equipped with the vulcanization agent feed inlet on the inlet tube, thoughtlessly congeal room, flocculation chamber bottom do not are equipped with coagulant feed inlet, flocculating agent feed inlet, the flocculation chamber right side is equipped with the discharge gate, deposit room, thoughtlessly congeal room, flocculation chamber bottom still are equipped with row mud mouth.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the wastewater is stirred and homogenized and then is sent into the reactor, by utilizing the grading reaction function in the reactor, the heavy metal ions of nickel, copper and arsenic in the wastewater, the organic sulfur agent, the coagulant and the flocculant are sequentially and gradually completed in the reactor, the processes of precipitation, coagulation and flocculation can be completed within 2-3 seconds, and the filtrate can reach the special emission limit requirement of heavy metal ions in the emission standard of nickel-copper-cobalt industrial pollutants (GB 25467-2010). The invention can realize the standard reaching of heavy metal ions through the first-stage reaction, saves the process procedures and process equipment needing to add an intermediate thickener, a filter press and the like in the multi-stage reaction process, can shorten the treatment process, simplify the operation, and reduce the investment and the operation cost.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic view of the structure of the reactor of the present invention.
In the figure: 1-shell, 101-partition board, 102-settling chamber, 103-coagulating chamber, 104-flocculating chamber, 105-water inlet pipe, 106-vulcanizing agent inlet port, 107-coagulant inlet port, 108-flocculant inlet port, 109-discharge port and 110-sludge discharge port.
Detailed Description
The present invention will be described in detail below with reference to specific examples.
Example 1
The waste water stock solution contains 33.21mg/L of nickel, 20.65 mg/L of copper and 12.33mg/L of arsenic.
The treatment method comprises the following steps:
simultaneously pumping the stirred and homogenized wastewater, a vulcanizing agent, a coagulant and a flocculant solution into a reactor from corresponding feed inlets; heavy metal ions of nickel, copper and arsenic in the wastewater and various medicaments are sequentially precipitated, coagulated and flocculated in different reaction chambers in the reactor, the effluent after reaction is subjected to filter pressing to remove sludge, the filtrate is discharged after reaching the standard, and the heavy metal is recovered from the filter cake; the vulcanizing agent is organic sulfur; the mass concentration of the vulcanizing agent solution is 3 percent; the amount of the sulfidizing agent solution added was 0.5% (by volume) of the amount of wastewater. The coagulant is polyaluminum ferric chloride; the mass concentration of the coagulant solution is 2.5 percent; the addition amount of the coagulant solution is 1-2% (volume ratio) of the amount of the wastewater. The flocculating agent is polyacrylamide;the mass concentration of the flocculant solution is 0.2%; the flocculant solution was added in an amount of 0.5% (volume by volume) based on the amount of wastewater. Wastewater flow rate of 11m3H, the treated water amount is about 75m3。
As shown in fig. 2, the reactor includes a shell 1, a partition plate 101 is arranged inside the shell 1, a gap is left between the partition plate 101 and the upper part of the shell 1, wastewater which is convenient for reaction flows into the next reaction chamber, the shell 1 is partitioned into a settling chamber 102, a coagulating chamber 103 and a flocculating chamber 104 by the partition plate 101, a water inlet pipe 105 is arranged at the bottom of the settling chamber 102, a vulcanizing agent inlet 106 is arranged on the water inlet pipe 105, a coagulant inlet 107 and a flocculant inlet 108 are respectively arranged at the bottoms of the coagulating chamber 103 and the flocculating chamber 104, a discharge port 109 is arranged at the right side of the flocculating chamber 104, a sludge discharge port 110 is further arranged at the bottoms of the settling chamber 102, the coagulating chamber 103 and the flocculating chamber 104, and sludge precipitated at the bottom of the. Heavy metal wastewater enters from a water inlet pipe 105 at the bottom of the settling chamber 102, a vulcanizing agent solution enters from a vulcanizing agent feed inlet 106 on the water inlet pipe 105, the heavy metal wastewater and the vulcanizing agent solution complete the precipitation arsenic removal reaction of the heavy metal wastewater in the settling chamber 102 of the reactor, and heavy metal ions are primarily coagulated. The wastewater after arsenic removal automatically flows into the coagulation chamber 103 through the upper part of the partition plate 101 to be mixed with coagulant polyaluminium chloride solution entering from a coagulant inlet 107, and the coagulation process of heavy metals is completed. The coagulated wastewater automatically flows into the flocculation chamber 104 through the upper part of the partition plate 101 to be mixed with the flocculant polyacrylamide solution entering from the flocculant inlet 108, the flocculation process of heavy metals is completed, the formed large-particle sludge-water mixture is discharged from the discharge port 109 and enters a sludge-water separation system, and sludge containing heavy metals is filtered (filter-pressed) and removed; and discharging the filtered clear liquid after reaching the standard.
Test results and analysis: the filtered solution contains less than or equal to 0.1mg/L of nickel, less than or equal to 0.1mg/L of copper and less than or equal to 0.1mg/L of arsenic, and all reach the standard. Meets the requirement of special emission limit of heavy metal ions in the emission standard of nickel-copper-cobalt industrial pollutants (GB 25467-2010).
Example 2
The waste water stock solution contains 24.45mg/L of nickel, 6.52 mg/L of copper and 19.32mg/L of arsenic. Waste water flow rate 15m3H, the treated water amount is about 80m3. The rest of the process was the same as in example 1.
Test results and analysis: the nickel, copper and arsenic in the filtered solution are all less than or equal to 0.1mg/L, the standard reaching rate is 100%, and the requirement of special emission limit value of heavy metal ions in the emission standard of pollutants for nickel-copper-cobalt industry (GB 25467-2010) is met.
Example 3
The waste water stock solution contains 13.56mg/L of nickel, 8.16 mg/L of copper and 12.78mg/L of arsenic. Wastewater flow 10m3H, the treated water amount is about 60m3. The procedure was as in example 1.
Test results and analysis: the nickel, copper and arsenic in the filtered solution are all less than or equal to 0.1mg/L, the standard reaching rate is 100%, and the requirement of special emission limit value of heavy metal ions in the emission standard of pollutants for nickel-copper-cobalt industry (GB 25467-2010) is met.
Claims (8)
1. A method for removing heavy metal ions in wastewater comprises the steps of pumping the wastewater after stirring and homogenizing, a vulcanizing agent, a coagulant and a flocculant solution into a reactor from corresponding feed inlets simultaneously; the heavy metal ions of nickel, copper and arsenic in the wastewater and various medicaments are sequentially precipitated, coagulated and flocculated in different reaction chambers in the reactor, the sludge in the effluent after reaction is removed by filter pressing, the filtrate is discharged after reaching the standard, and the heavy metal is recovered by a filter cake backfire system.
2. The method for removing heavy metal ions in wastewater according to claim 1, wherein: the sulfuration agent is organic sulfur.
3. The method for removing heavy metal ions in wastewater according to claim 1, wherein: the mass concentration of the vulcanizing agent solution is 3-5%; the addition amount of the vulcanizing agent solution is 0.5-1% of the volume of the wastewater.
4. The method for removing heavy metal ions in wastewater according to claim 1, wherein: the coagulant is polymeric aluminum ferric sulfate.
5. The method for removing heavy metal ions in wastewater according to claim 1, wherein: the mass concentration of the coagulant solution is 2.5-5%; the addition amount of the coagulant solution is 1-2% of the volume of the wastewater.
6. The method for removing heavy metal ions in wastewater according to claim 1, wherein: the flocculant is polyacrylamide.
7. The method for removing heavy metal ions in wastewater according to claim 1, wherein: the mass concentration of the flocculant solution is 0.1-0.3%; the addition amount of the flocculant solution is 0.5-1% of the volume of the wastewater.
8. The method for removing heavy metal ions in wastewater according to claim 1, wherein: the reactor includes the casing, the inside baffle that is equipped with of casing, the baffle leaves the clearance with casing upper portion, the baffle is the deposit room, thoughtlessly congeals room, flocculation chamber with the casing interval, the deposit room bottom is equipped with the inlet tube, be equipped with the vulcanization agent feed inlet on the inlet tube, thoughtlessly congeal room, flocculation chamber bottom do not are equipped with coagulant feed inlet, flocculating agent feed inlet, the flocculation chamber right side is equipped with the discharge gate, deposit room, thoughtlessly congeal room, flocculation chamber bottom still are equipped with row mud mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011535115.2A CN112537834A (en) | 2020-12-23 | 2020-12-23 | Method for removing heavy metal ions in wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011535115.2A CN112537834A (en) | 2020-12-23 | 2020-12-23 | Method for removing heavy metal ions in wastewater |
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| CN112537834A true CN112537834A (en) | 2021-03-23 |
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| CN202011535115.2A Pending CN112537834A (en) | 2020-12-23 | 2020-12-23 | Method for removing heavy metal ions in wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666467A (en) * | 2021-08-24 | 2021-11-19 | 云南铜业股份有限公司西南铜业分公司 | Integrated reaction system and control method thereof |
| CN114162950A (en) * | 2021-12-02 | 2022-03-11 | 扬州市景杨表面工程有限公司 | Nickel-containing waste liquid treatment and comprehensive utilization process |
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2020
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Patent Citations (3)
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| CN103819023A (en) * | 2014-02-28 | 2014-05-28 | 金川集团股份有限公司 | Treatment and recycling method of industrial wastewater containing a plurality of heavy metal ions |
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| CN206127018U (en) * | 2016-10-20 | 2017-04-26 | 上海龙净环保科技工程有限公司 | Pretreatment systems suitable for thermal power plant's desulfurization waste water |
Non-Patent Citations (1)
| Title |
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| 中国环境科学学会编: "《中国环境科学学会学术年会论文集 2010 第4卷》", vol. 1, 哈尔滨：哈尔滨工业大学出版社, pages: 3400 - 3401 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666467A (en) * | 2021-08-24 | 2021-11-19 | 云南铜业股份有限公司西南铜业分公司 | Integrated reaction system and control method thereof |
| CN114162950A (en) * | 2021-12-02 | 2022-03-11 | 扬州市景杨表面工程有限公司 | Nickel-containing waste liquid treatment and comprehensive utilization process |
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Application publication date: 20210323 |